function main() {
    // console.log(utils);
    const canvas = document.getElementById('example');
    if (!canvas) {
        console.log('Failed to retrieve the <canvas> element');
        return false;
    }

    const ctx = canvas.getContext('2d');
    ctx.fillStyle = 'rgba(0,0,255,1.0)';
    ctx.fillRect(120, 10, 150, 150);
}

main();
